JP2011129354A - Light source device and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of aiming at sufficiently higher luminance as compared with a conventional one. <P>SOLUTION: The light source device includes a solid light source 5 emitting light of a prescribed wavelength out of a wavelength region from an ultraviolet light to a visible light, a phosphor layer 2 including at least one kind of phosphors which is excited by an exciting light from the solid light source 5 and emits fluorescent light of a wavelength longer than the light emitting wavelength of the solid light source 5, and a heat radiating substrate 6 set on a face side opposite to the face side into which the excited light from the phosphor layer 2 is made incident. The phosphor layer 2 does not contain a resin composition substantially, and the solid light source 5 and the phosphor layer 2 are located in separation spatially, and a fluorescent light is extracted by using reflection by a reflection surface provided on the opposite side to the side face, out of the faces of the phosphor layer 2, where the excited light is made incident. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light source device and an illumination device.

  A light source device combining an optical semiconductor such as an LED and a phosphor layer has been widely used. However, in recent years, the brightness has been increased, and its application range such as general lighting and automobile headlamps has been expanded. It is considered that such light source devices will continue to be widely used in various applications by increasing the luminance.

  As a means for increasing the brightness of a light source device combining such an optical semiconductor and a phosphor layer, it is conceivable to increase the excitation light intensity from the optical semiconductor by supplying a large current to the optical semiconductor. Heat is generated in the phosphor layer, and in the phosphor layer, the fluorescence intensity decreases due to discoloration of the resin component or temperature quenching of the phosphor. Therefore, as a result, the emission intensity is saturated and decreased, and it is difficult to increase the luminance of the light source device that combines the optical semiconductor and the phosphor layer.

  Here, the discoloration of the resin component in the phosphor layer means that the phosphor layer is usually formed into a fixed shape with good reproducibility. This is a phenomenon in which the resin component is discolored when the resin component is heated to about 200 ° C. or higher. Since the resin component is inherently transparent, if the resin component is discolored by heat, it absorbs a part of the excitation light from the optical semiconductor and the fluorescence from the phosphor layer, which prevents high brightness. It was.

  The temperature quenching of the phosphor is a phenomenon in which the fluorescence intensity decreases when the phosphor is heated. If the fluorescence intensity decreases due to temperature quenching, the energy that has not been converted to fluorescence becomes heat, so the amount of heat generated by the phosphor increases, the temperature of the phosphor rises, temperature quenching proceeds, and the fluorescence intensity further decreases. This happens. For this reason, temperature quenching of the phosphors generated by heat has also been a factor that hinders high brightness.

  In order to solve these problems, Patent Document 1 proposes a light source device using a phosphor layer that does not contain a resin. In this case, since the phosphor layer does not contain a resin component, discoloration does not occur, and furthermore, temperature quenching does not occur because the phosphor layer is a ceramic layer of a phosphor with low temperature sensitivity, so that high brightness can be achieved. is there. In addition, as shown in FIG. 1, the phosphor layer 92 is directly bonded to the optical semiconductor (solid light source) 95 to dissipate heat generated in the phosphor layer 92 to the optical semiconductor (solid light source) 95 side. It was.

JP 2006-005367 A

  Incidentally, in the conventional light source device in which the optical semiconductor (solid light source) 95 and the phosphor layer 92 are directly bonded as shown in FIG. 1, the phosphor layer excited by the excitation light from the optical semiconductor (solid light source) 95. The light emitted from the light 92 (fluorescence) is emitted to the side opposite to the optical semiconductor (solid light source) 95 side, and the light semiconductor (solid light source) 95 that is not absorbed by the phosphor layer 92 and passes through the phosphor layer 92. The excitation light from is used. That is, the light source device of FIG. 1 is of a transmissive type that uses light transmitted through the phosphor layer 92.

  Here, when light emitted from the phosphor layer 92 is considered, there is also light reflected from the interface with the phosphor layer 92 together with the transmitted light and returning to the optical semiconductor (solid light source) 95 side, that is, reflected light. This light (reflected light) is re-absorbed by the optical semiconductor (solid light source) 95, so that there is a problem that the light cannot be used as illumination light.

  1 is intended to dissipate the heat of the phosphor layer 92 to the optical semiconductor (solid light source) 95 side, but the excitation light intensity of the optical semiconductor (solid light source) 95 is increased. Since heat is generated not only in the phosphor layer 92 but also in the optical semiconductor (solid light source) 95, the heat generated in the phosphor layer 92 is dissipated from the side of the optical semiconductor (solid light source) 95 that is also generating heat. There was a problem that the efficiency of was not good.

  As described above, the light source device shown in FIG. 1 has a limitation on high luminance because it is of a transmissive type and the efficiency of heat dissipation with respect to the heat generation of the phosphor layer 92 is not good.

  An object of the present invention is to provide a light source device and an illuminating device capable of achieving a sufficiently high luminance as compared with the conventional art.

  In order to achieve the above object, the invention described in claim 1 is excited by a solid light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and excitation light from the solid light source. A phosphor layer containing at least one type of phosphor that emits fluorescence having a longer wavelength than the emission wavelength of the solid-state light source, and a surface of the phosphor layer opposite to the surface on which the excitation light is incident; The phosphor layer substantially does not contain a resin component, the solid light source and the phosphor layer are spatially separated from each other, and are excited among the surfaces of the phosphor layer. The light source device is characterized in that fluorescence is extracted using reflection by a reflection surface provided on the side opposite to a surface on which light is incident.

  According to a second aspect of the present invention, in the light source device according to the first aspect, the phosphor layer is phosphor ceramic.

  According to a third aspect of the present invention, in the light source device according to the first or second aspect, the phosphor layer is bonded to the heat dissipation substrate via a metal.

  According to a fourth aspect of the present invention, in the light source device according to any one of the first to third aspects, the light source device includes a fluorescent rotating body having the phosphor layer and the heat dissipation substrate. It is characterized by having.

  The invention according to claim 5 is an illumination device characterized by using the light source device according to any one of claims 1 to 4.

  According to the first to fifth aspects of the present invention, the solid light source that emits light having a predetermined wavelength in the wavelength region from ultraviolet light to visible light, and the solid that is excited by the excitation light from the solid light source. A phosphor layer containing at least one type of phosphor that emits fluorescence having a wavelength longer than the emission wavelength of the light source, and heat dissipation provided on the surface of the phosphor layer opposite to the surface on which the excitation light is incident A substrate, the phosphor layer substantially does not contain a resin component, the solid light source and the phosphor layer are arranged spatially separated from each other, and excitation light out of the surface of the phosphor layer Since the fluorescence is extracted using the reflection by the reflection surface provided on the side opposite to the incident side, it is possible to achieve a sufficiently high luminance as compared with the conventional case.

  Particularly, according to the invention described in claim 3, in the light source device according to claim 1 or 2, since the phosphor layer is bonded to the heat dissipation substrate via a metal, The efficiency of heat dissipation can be further increased, and higher brightness can be achieved.

  According to a fourth aspect of the present invention, in the light source device according to any one of the first to third aspects, the light source device includes a fluorescent rotator having the phosphor layer and the heat dissipation substrate. Therefore, by rotating the phosphor layer with respect to the solid light source, it is possible to disperse the place where the excitation light from the solid light source hits, and to suppress the heat generation in the light irradiating part. The brightness can be increased.

It is a figure which shows the conventional light source device. It is a figure which shows the example of 1 structure of the light source device of this invention. It is a figure which shows the structural example which provided structures, such as a fin, in the thermal radiation board | substrate. It is a figure which shows the structural example on which the several fluorescent substance layer which consists of a mutually different fluorescent substance was laminated | stacked. It is a figure which shows the example comprised as a reflection type fluorescence rotary body which rotates a fluorescent substance layer around a rotating shaft. It is a figure which shows the structural example about the fluorescent substance layer of a reflection type fluorescent rotating body. It is a figure which shows the other structural example about the fluorescent substance layer of a reflection type fluorescent rotator. It is a figure which shows the other structural example about the fluorescent substance layer of a reflection type fluorescent rotator. It is a figure which shows the other structural example about the fluorescent substance layer of a reflection type fluorescent rotator. It is a figure which shows the other structural example about the fluorescent substance layer of a reflection type fluorescent rotator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 2A and 2B are diagrams showing a configuration example of the light source device of the present invention. 2A is a front view of the whole, and FIG. 2B is a plan view of a portion where a phosphor layer is provided. Referring to FIGS. 2A and 2B, the light source device 10 includes a solid-state light source 5 that emits light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light, A phosphor layer 2 including at least one kind of phosphor that is excited by excitation light and emits fluorescence having a wavelength longer than that of the solid light source 5, and the solid light source 5 and the phosphor layer 2 are spatially separated. Are located apart.

  Here, the phosphor layer 2 is substantially free of a resin component.

  In addition, a heat dissipation substrate 6 is provided on the surface of the phosphor layer 2 opposite to the surface on which the excitation light is incident, and the phosphor layer 2 is bonded to the heat dissipation substrate 6 by the joint portion 7. Yes. Here, as described later, a material having a high thermal conductivity is preferably used for the joint portion 7.

  Moreover, in this light source device 10, light, such as fluorescence, is taken out using the reflection by the reflective surface provided on the opposite side to the surface where the excitation light from the solid light source 5 is incident on the surface of the phosphor layer 2. A method (hereinafter referred to as a reflection method) is employed.

  As described above, the light source device 10 is basically characterized in that the solid light source 5 and the phosphor layer 2 are spatially separated and light emission is used in a reflective manner.

  That is, as in the conventional light source device shown in FIG. 1, when the phosphor layer 92 is in contact with the solid light source 95, both the phosphor layer 92 and the solid light source 95 are used even if the luminance is increased. However, in the light source device 10 shown in FIGS. 2A and 2B, the phosphor layer 2 is arranged away from the solid light source 5 because the heat dissipation efficiency from the phosphor layer 92 is poor. As a result, even when the luminance is increased, the heat from the phosphor layer 2 can be dissipated to the low-temperature heat dissipation substrate 6 via the joint portion 7, and the efficiency of heat dissipation from the phosphor layer 2 can be reduced. Compared to the conventional light source device shown in FIG.

  Further, in the conventional light source device shown in FIG. 1, among the excitation light from the solid light source 95 and the fluorescence from the phosphor layer 92, the fluorescence emitted to the side opposite to the solid light source 95 and the phosphor layer 92 Excitation light from a solid light source 95 that is transmitted without being absorbed is used. In other words, the transmission method is used. Here, in the transmission method, when the emitted light from the phosphor layer 92 is considered, the excitation light is reflected at the interface with the phosphor layer 92 together with the transmitted light and returns to the solid light source 95 side, that is, reflected. There is also light, and this reflected light is reabsorbed by the solid light source 95 and becomes light that cannot be used as illumination light. Further, since the fluorescence from the phosphor layer 92 is emitted from both sides of the phosphor layer 92, the light emitted to the solid light source 95 side cannot be used. Thus, in the transmission method, the light use efficiency is reduced. In addition, in the transmission method, in order to obtain illumination light with a desired chromaticity, it is necessary to increase the thickness of the phosphor layer 92, and the distance from the phosphor layer 92 to the solid light source 95 becomes long. It was disadvantageous in dissipating the heat from 92 to the solid light source 95.

  On the other hand, in the light source device 10 of FIGS. 2A and 2B, the light (excitation light, fluorescence) emitted to the side opposite to the solid light source 5 is reflected on the reflective surface (for example, the reflective surface of the substrate). Since the reflection method reflecting to the 5 side is adopted, all of the light emission (fluorescence) from the phosphor layer 2 excited by the excitation light from the solid light source 5 (that is, the fluorescence emitted to the solid light source 5 side) and Since all of the excitation light from the solid light source 5 that is not absorbed by the phosphor layer 2 (that is, the reflected light of the light from the solid light source 5 that is not absorbed by the phosphor layer 2) can be used as illumination light ( That is, since both excitation light and fluorescence can be efficiently used as illumination light), the light use efficiency can be remarkably increased, and high brightness can be achieved. In contrast to the transmission type, in the reflection type, even if the thickness of the phosphor layer 2 is less than half, the optical path lengths in the phosphor layer 2 are equal, and light of the same chromaticity can be obtained. In addition, the distance from the phosphor layer 2 to the substrate 6 is shortened, which is advantageous in terms of heat dissipation.

  As described above, in the light source device 10 of FIGS. 2A and 2B, the solid light source 5 and the phosphor layer 2 are basically spatially separated and light emission is used in a reflective manner. Therefore, it is possible to achieve a sufficiently high brightness as compared with the conventional case.

  Further, in the light source device 10 shown in FIGS. 2A and 2B, since the phosphor layer 2 that does not substantially contain a resin component is used, there is no discoloration due to heat and light absorption is small. For this reason, it is possible to further increase the luminance.

  Here, the phosphor layer 2 substantially not containing a resin component means that the resin component normally used for forming the phosphor layer is 5 wt% or less of the phosphor layer. As a material for realizing such a phosphor layer, a phosphor powder dispersed in glass, a glass phosphor in which a luminescent center ion is added to a glass matrix, a phosphor single crystal, or a phosphor polycrystal (hereinafter referred to as a phosphor) And phosphor ceramics). The phosphor ceramic is a lump of phosphor that is formed by firing a material into an arbitrary shape before firing in the phosphor manufacturing process. Phosphor ceramics may use an organic substance as a binder in the molding process in the manufacturing process. However, since the organic component is burned off by providing a degreasing process after molding, the phosphor ceramics after firing have an organic resin component. Remains only 5 wt% or less. Therefore, since the phosphor layer mentioned here does not substantially contain a resin component and is composed only of an inorganic substance, discoloration due to heat does not occur. In addition, glass or ceramics made of only an inorganic substance generally has a higher thermal conductivity than a resin, and is therefore advantageous in heat dissipation from the phosphor layer 2 to the substrate 6. In particular, phosphor ceramics generally have higher thermal conductivity than glass and are less expensive to manufacture than single crystals. Therefore, it is preferable to use them for the phosphor layer 2.

  The phosphor layer 2 includes at least one kind of phosphor that is excited by excitation light from the solid light source 5 and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source 5. Specifically, when the solid-state light source 5 emits ultraviolet light, the phosphor layer 2 includes at least one kind of phosphor among phosphors such as blue, green, and red. When the solid light source 5 emits ultraviolet light, the phosphor layer 2 contains, for example, blue, green, and red phosphors (the blue, green, and red phosphors are, for example, uniformly When the phosphor layer 2 is irradiated with ultraviolet light from the solid light source 5, white illumination light can be obtained as reflected light. Moreover, when the solid light source 5 emits blue light as visible light, the phosphor layer 2 includes at least one kind of phosphor among phosphors such as green, red, and yellow. When the solid-state light source 5 emits blue light as visible light, when the phosphor layer 2 contains, for example, green and red phosphors (the green and red phosphors are dispersed uniformly, for example) When the phosphor layer 2 is irradiated with blue light from the solid light source 5, illumination light such as white can be obtained as reflected light. Further, when the solid light source 5 emits blue light as visible light, for example, when the phosphor layer 2 contains only a yellow phosphor, the blue light from the solid light source 5 is emitted from the phosphor layer 2. When illuminating, illumination light such as white can be obtained as reflected light.

  Further, in the light source device 10 of FIGS. 2A and 2B, the heat dissipation substrate 6 includes light (light emission (fluorescence) from the phosphor layer 2 excited by excitation light from the solid light source 5 and phosphor layer). The role of the reflecting surface for the light from the solid light source 5 not absorbed by 2), the role of dissipating the heat dissipated from the phosphor layer 2 to the outside, and the role of the support substrate of the phosphor layer 2 is there. For this reason, high light reflection characteristics, heat transfer characteristics, and workability are required. The heat dissipation substrate 6 can be a metal substrate, oxide ceramics such as alumina, or non-oxide ceramics such as aluminum nitride, but a metal substrate having particularly high light reflection characteristics, heat transfer characteristics, and workability is used. It is desirable to be done.

  In addition, an organic adhesive, an inorganic adhesive, low-melting glass, metal (metal brazing), or the like can be used for the joint 7 between the phosphor layer 2 and the heat dissipation substrate 6. The junction 7 also has a reflection surface for light (light emission (fluorescence) from the phosphor layer 2 excited by excitation light from the solid light source 5 and light from the solid light source 5 not absorbed by the phosphor layer 2). Since it plays a role and a role to dissipate heat from the phosphor layer, it is desirable to use a metal (metal brazing) having both high light reflection characteristics and heat transfer characteristics.

  Next, the light source device 10 shown in FIGS. 2A and 2B will be described in more detail.

  In the light source device 10 shown in FIGS. 2A and 2B, the solid-state light source 5 can be a light emitting diode or a semiconductor laser having an emission wavelength from ultraviolet light to visible light.

More specifically, the solid-state light source 5 may be, for example, a light emitting diode or semiconductor laser that emits near-ultraviolet light having an emission wavelength of about 380 nm using an InGaN-based material. In this case, the phosphor of the phosphor layer 2 is excited by ultraviolet light having a wavelength of about 380 nm to about 400 nm. For example, the red phosphor has CaAlSiN ₃ : Eu ²⁺ , Ca ₂ Si ₅ N _8. : Eu ²⁺ , La ₂ O ₂ S: Eu ³⁺ , KSiF ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ⁴⁺ can be used, and (Si, Al) ₆ (O, N): Eu can be used as a green phosphor. ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ , (Ba, Sr) ₂ SiO ₄ : Eu ^{2+ and the} like can be used, and (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) is used as a blue phosphor. ^{_{) 6 C l2: Eu 2+,}} BaMgAl 10 O 17: Eu 2+, LaAl (Si, Al) 6 (N, O) 10: Ce 3+ and the like can be used.

The solid light source 5 may be, for example, a light emitting diode or a semiconductor laser that emits blue light having a light emission wavelength of about 460 nm using a GaN-based material. In this case, the phosphor of the phosphor layer 2 is excited by blue light having a wavelength of about 440 nm to about 470 nm. For example, the red phosphor has CaAlSiN ₃ : Eu ²⁺ , Ca ₂ Si ₅ N _8. : Eu ²⁺ , KSiF ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ⁴⁺ can be used, and Y ₃ (Ga, Al) ₅ O ₁₂ : Ce ³⁺ , Ca ₃ Sc ₂ Si ₃ O ₁₂ can be used as a green phosphor. : Ce ³⁺ , CaSc ₂ O ₄ : Eu ²⁺ , (Ba, Sr) ₂ SiO ₄ : Eu ²⁺ , Ba ₃ Si ₆ O ₁₂ N ₂ : Eu ²⁺ , (Si, Al) ₆ (O, N): Eu ²⁺ Etc. can be used. Moreover, as what is excited by blue light having a wavelength of about 440 nm to about 470 nm, for example, Y ₃ Al ₅ O ₁₂ : Ce ³⁺ (YAG), (Sr, Ba) ₂ SiO ₄ : Eu ²⁺ , Ca _x (Si , Al) ₁₂ (O, N) ₁₆ : Eu ²⁺ or the like can be used.

As the phosphor layer 2, a phosphor in which these phosphor powders are dispersed in glass, a glass phosphor in which a luminescent center ion is added to a glass matrix, a phosphor ceramic that does not include a binding member such as a resin, or the like is used. Can do. As a specific example of the phosphor powder dispersed in glass, the phosphor powder having the composition listed above is contained in a glass containing components such as P ₂ O ₃ , SiO ₂ , B ₂ O ₃ , and Al ₂ O _3. Are dispersed. Examples of glass phosphors in which a luminescent center ion is added to a glass matrix include Ca—Si—Al—O—N and Y—Si—Al—O—N systems in which Ce ³⁺ or Eu ²⁺ is added as an activator. Examples thereof include oxynitride glass phosphors. Examples of the phosphor ceramic include a sintered body having a phosphor composition having the above-described composition and substantially not including a resin component. Among these, it is desirable to use a phosphor ceramic having translucency. This is a phosphor ceramic that has translucency because there are almost no pores or impurities at grain boundaries that cause light scattering in the sintered body. Since pores and impurities can also prevent thermal diffusion, translucent ceramics exhibit high thermal conductivity. For this reason, when it uses as a fluorescent substance layer, it can take out from a fluorescent substance layer, and can utilize it, without losing excitation light and fluorescence by spreading | diffusion, Furthermore, the heat | fever which generate | occur | produced in the fluorescent substance layer can be dissipated efficiently. Even a sintered body that does not show translucency is desirable to have as few pores and impurities as possible. As an index for evaluating the residual amount of pores, the value of specific gravity of the phosphor ceramic can be used, and it is desirable that the value is 95% or more with respect to the theoretical value by which the value is calculated.

Here, a method of manufacturing a phosphor ceramic having translucency will be described by taking as an example a Y ₃ Al ₅ O ₁₂ : Ce ³⁺ phosphor which is a blue-excited yellow light-emitting phosphor. The phosphor ceramic is manufactured through a starting material mixing process, a forming process, a firing process, and a processing process. As starting materials, yttrium oxide, cerium oxide, alumina, and the like, oxides of constituent elements of Y ₃ Al ₅ O ₁₂ : Ce ³⁺ phosphor, carbonates, nitrates, sulfates and the like that become oxides after firing are used. The particle size of the starting material is preferably a submicron size. These raw materials are weighed so as to have a stoichiometric ratio. At this time, for the purpose of improving the transmittance of the ceramic after firing, it is also possible to add a compound such as calcium or silicon. The weighed raw materials are sufficiently dispersed and mixed by a wet ball mill using water or an organic solvent. Next, the mixture is formed into a predetermined shape. As the molding method, a uniaxial pressing method, a cold isostatic pressing method, a slip casting method, an injection molding method, or the like can be used. The obtained molded body is fired at 1600 to 1800 ° C. Thus, translucent ^{_{Y 3 Al 5 O 12: Ce}} 3+ phosphor ceramic can be obtained.

  The phosphor ceramic produced as described above is polished to a thickness of several tens to several hundreds of μm using an automatic polishing apparatus, and further, circular or diced by dicing or scribing using a diamond cutter or laser. Cut out to a board of any shape such as a square, fan or ring.

  Here, phosphor ceramics have a high refractive index with respect to air, and there are few things that cause scattering such as pores inside, and light is guided inside the ceramics. The light emission component emitted from the side surface increases, and the light emission component emitted in the front direction decreases. In order to solve this problem, the light emission component emitted in the front direction can be increased by providing an uneven light extraction structure by etching on the ceramic surface, mounting a lens, or providing a reflective layer on the side surface. Is also possible.

  Moreover, although a metal substrate, oxide ceramics, non-oxide ceramics, etc. can be used for the heat dissipation substrate 6, it is desirable to use a metal substrate having particularly high light reflection characteristics, heat transfer characteristics, and workability. As the metal, simple substances such as Al, Cu, Ti, Si, Ag, Au, Ni, Mo, W, Fe, Pd, and alloys containing them can be used. Further, the surface of the heat dissipation substrate 6 may be coated for the purpose of preventing reflection and corrosion. Moreover, in order to improve heat dissipation, the heat dissipation substrate 6 may be provided with a structure 8 such as a fin as shown in FIG.

  In addition, an organic adhesive, an inorganic adhesive, low-melting glass, metal brazing, or the like can be used for the joint 7 between the phosphor layer 2 and the heat dissipation substrate 6. Among these, it is desirable to use metal brazing that can achieve both high reflectance and heat transfer characteristics. The ceramic (phosphor layer 2) and the metal substrate (heat dissipation substrate 6) can be joined by first forming a metal film on the ceramic side and brazing the metal film to the metal substrate. The metal film can be formed on the ceramic by a vacuum deposition method, a sputtering method, a refractory metal method, or the like. The refractory metal method is a method in which an organic binder containing metal fine particles is applied to the surface of a ceramic and heated to 1000 to 1700 ° C. in a reducing atmosphere containing water vapor and hydrogen. For the metal film formed at this time, a simple substance or an alloy containing Si, Nb, Ti, Zr, Mo, Ni, Mn, W, Fe, Pt, Al, Au, Pd, Ta, Cu, or the like is used. Further, as the metal brazing material, a brazing material containing Ag, Cu, Zn, Ni, Sn, Ti, Mn, In, Bi, or the like can be used. If necessary, the oxide film on the joining surface of the metal film and the metal can be removed with a flux, a metal brazing material is placed on the joining surface, heated to 200 to 800 ° C., and cooled to be joined. Further, in order to prevent destruction of the joint surface due to the difference in expansion coefficient between the ceramic and the metal after joining, the joining may be performed with a substance having an intermediate expansion coefficient between the ceramic and the metal interposed.

  In the light source device 10 of FIGS. 2A and 2B, only one phosphor layer 2 is provided. For example, as shown in FIG. 4, a plurality of phosphor layers (FIG. 4) are provided. In the example, it is possible to adopt a configuration in which two phosphor layers 2j and 2k) are laminated. In this case, for example, when the solid light source 5 emits blue light as visible light, the phosphor layer 2j is made of a green phosphor, and the phosphor layer 2k is a red phosphor. If it is used, illumination light such as white can be obtained as reflected light.

  Moreover, in the light source device 10 of FIGS. 2A and 2B, the phosphor layer 2 may be fixed, but the phosphor layer 2 may be configured to be movable. For example, as shown in FIG. 5, the phosphor layer 2 can be configured as a reflection type fluorescent rotating body 1 that rotates around a rotation axis X (rotated by a motor 4 or the like). That is, the reflection type fluorescent rotator 1 can be realized by connecting the phosphor layer 2 and the heat dissipation substrate 6 joined to the motor 4 or the like. In the reflection type fluorescent rotating body 1, the heat dissipation substrate 6 and the joint 7 function as a reflection surface for excitation light and fluorescence. In addition, the shape of the heat dissipation substrate 6 may be a disk shape or a quadrangle. In addition, in order to ensure the stability of rotation, it is possible to cut out a part of the disk or to have a shape with a weight on the contrary.

  In the example of FIG. 5, only one type of phosphor layer is used as the phosphor layer 2 of the reflective phosphor rotator 1. Specifically, in the example of FIG. 5, only the phosphor layer made of, for example, a yellow phosphor is used as the phosphor layer 2 of the reflective phosphor rotator 1, and in this case, the solid light source 5 emits blue light. If it is used, illumination lights, such as white, can be obtained as reflected light. Alternatively, in the example of FIG. 5, as the phosphor layer 2 of the reflective phosphor rotator 1, for example, a phosphor layer in which, for example, blue, green, and red phosphors are uniformly dispersed and mixed, for example. In this case, if a solid-state light source that emits ultraviolet light is used, illumination light such as white can be obtained as reflected light. However, the present invention is not limited to this, and various modifications are possible. That is, the phosphor layer 2 of the reflection type fluorescent rotator 1 can be configured such that at least one phosphor layer of blue, green, yellow, red, or the like is disposed. FIGS. 6A, 6B, 7A, 7B, 8A, 8B, 9A, and 9B show the fluorescence of the reflection type fluorescent rotator 1. FIG. Various configuration examples for the body layer 2 are shown. 6A, FIG. 7A, FIG. 8A, and FIG. 9A are plan views, respectively, FIG. 6B, FIG. 7B, FIG. 8B, and FIG. (B) is sectional drawing in the AA line | wire of Fig.6 (a), Fig.7 (a), Fig.8 (a), and Fig.9 (a), respectively. The example of FIGS. 6A and 6B is a case where only one type of phosphor layer (for example, a phosphor layer made of a yellow phosphor) is used as the phosphor layer 2, and the example of FIG. It corresponds. In the example of FIGS. 7A and 7B, two types of phosphor layers 2a and 2b (for example, a red phosphor layer 2a made of a red phosphor) are used as the phosphor layer 2 of the reflective phosphor rotator 1. And a green phosphor layer 2b) made of green phosphor is provided as a phosphor region divided into two equal parts. In this case, if a solid light source that emits blue light is used, the reflection type fluorescence Illumination light such as white can be obtained as reflected light when the rotating body 1 rotates. 8 (a) and 8 (b) show three types of phosphor layers 2a, 2b, and 2c (for example, a red phosphor composed of a red phosphor) as the phosphor layer 2 of the reflection type fluorescent rotator 1. The green phosphor layer 2b composed of the layer 2a, the green phosphor, and the blue phosphor layer 2c) composed of the blue phosphor are provided as phosphor regions divided into three equal parts. In this case, the solid light source 5 If a material that emits ultraviolet light is used, illumination light such as white can be obtained as reflected light when the reflective fluorescent rotating body 1 is rotated. 9A and 9B show two types of phosphor layers 2a and 2b (for example, a red phosphor layer 2a made of a red phosphor) as the phosphor layer 2 of the reflective phosphor rotator 1. And a green phosphor layer 2b made of a green phosphor is provided as a phosphor region, and a region where no phosphor layer is provided is provided as a non-phosphor region 12c. In this case, the solid light source 5 is blue. If a light emitting material is used, illumination light such as white can be obtained as reflected light when the reflective fluorescent rotator 1 is rotated. In addition, various modifications are possible.

  Further, in each of the above examples of the reflective fluorescent rotator 1, when using a plurality of phosphor layers, the phosphor layers are arranged side by side in the horizontal direction, but in FIGS. 10 (a) and 10 (b). As shown, a plurality of phosphor layers (in the example of FIGS. 10A and 10B, two phosphor layers 2j and 2k) may be arranged vertically stacked (stacked). 10A is a plan view, and FIG. 10B is a cross-sectional view taken along line AA in FIG. 10A. In this case, for example, when the solid light source 5 emits blue light as visible light, the phosphor layer 2j is made of a green phosphor, and the phosphor layer 2k is made of a red phosphor. If a thing is used, illumination lights, such as white, can be obtained as reflected light.

  In this way, by configuring the phosphor layer 2 as the reflection-type phosphor rotator 1 that rotates around the rotation axis X (rotates by the motor 4 or the like), that is, the phosphor layer 2 is formed with respect to the solid light source 5. By rotating, it is possible to disperse the place where the excitation light from the solid light source 5 hits, and to suppress the heat generation in the light irradiating part (using this fluorescent rotating body 1 can suppress the heat generation of the fluorescent substance in the first place). This makes it possible to further increase the brightness.

  As described above, in the present invention, the solid-state light source 5 and the phosphor layer 2 are installed on the same side with respect to the heat radiating substrate 6 to provide a reflective light source device. Of course, if necessary, an optical element such as a lens can be inserted between the solid-state light source 5 and the phosphor layer 2.

  Further, by combining the above-described various light source devices of the present invention with optical components such as a predetermined lens system, it is possible to provide an illumination device capable of increasing the brightness.

The present invention can be used for lighting in general.

DESCRIPTION OF SYMBOLS 1 Fluorescence rotating body 2 Fluorescent substance layer 4 Motor 5 Solid light source 6 Heat dissipation board 7 Junction part 10 Light source device

Claims (5)

A solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and at least emits fluorescence having a wavelength longer than the emission wavelength of the solid-state light source when excited by excitation light from the solid-state light source A phosphor layer including one type of phosphor, and a heat dissipation substrate provided on a surface of the phosphor layer opposite to the surface on which the excitation light is incident, the phosphor layer being substantially a resin The solid light source and the phosphor layer are spatially separated from each other, and the reflection is provided on the opposite side of the surface of the phosphor layer from the surface on which excitation light is incident. A light source device that extracts fluorescence using reflection by a surface. 2. The light source device according to claim 1, wherein the phosphor layer is phosphor ceramic. 3. The light source device according to claim 1, wherein the phosphor layer is bonded to the heat dissipation substrate via a metal. 4. The light source device according to claim 1, wherein the light source device includes a fluorescent rotator including the phosphor layer and the heat dissipation substrate. 5. An illumination device, wherein the light source device according to any one of claims 1 to 4 is used.

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